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Stock-Based Incentive Compensation Plans - Stock Option Activity (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares
Number of Shares |  |
Beginning balance (in shares) | shares | 3,001,929 |
Options granted (in shares) | shares | 100,080 |
Options exercised (in shares) | shares | (395,117) |
Options canceled (in shares) | shares | (65,694) |
Ending balance (in shares) | shares | 2,641,198 | 3,001,929
Options vested and exercisable (in shares) | shares | 1,762,687 |
Options vested and expected to vest (in shares) | shares | 2,366,723 |
Weighted-Average Exercise Price |  |
Beginning balance (in dollars per share) | $ / shares | $ 4.15 |
Options granted (in dollars per share) | $ / shares | 8.88 |
Options exercised (in dollars per share) | $ / shares | 4.08 |
Options canceled (in dollars per share) | $ / shares | 4.81 |
Ending balance (in dollars per share) | $ / shares | 4.27 | $ 4.15
Options vested and exercisable (in dollars per share) | $ / shares | 3.73 |
Options vested and expected to vest (in dollars per share) | $ / shares | $ 4.14 |
Weighted-Average Remaining Contractual Life and Aggregate Intrinsic Value |  |
Weighted-average remaining contractual life, options outstanding (in years) | 6 years 7 months 6 days |
Weighted-average remaining contractual life, options vested and exercisable (in years) | 5 years 11 months 8 days |
Weighted-average remaining contractual life, options vested and expected to vest (in years) | 6 years 5 months 27 days |
Aggregate intrinsic value | $ | $ 43,905 | $ 3,585
Aggregate intrinsic value, options vested and exercisable | $ | 41,882 |
Aggregate intrinsic value, options vested and expected to vest | $ | $ 40,154 |

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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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